浅谈改性沥青

简述了改性沥青的概念，高分子聚合物改性沥青的分类、特性、应用范围以及改性沥青的评价标准。未来沥青材料的主要研究方向是新型沥青改性剂和沥青改性产品的开发以及完善现有的沥青评价体系，同时，建立能够综合描述沥青各种性能的理论模型也是未来改性沥青研究的重要范畴。     

丁苯橡胶改性阳离子乳化沥青防水涂料的研制

介绍了采用ＳＢＲ胶乳改性沥青制备乳化沥青防水涂料的新工艺，并对所得涂料的性能进行了测试，得到了肯定的结论     

高沥青质塔河原油制备道路沥青的工艺及性能评价

提出了以高沥青质的塔河原油生产重交通道路沥青和聚合物改性道路沥青的制备工艺,并对产品进行了路用性能评价。采用增延剂和其他添加剂可以制备性能优良的重交沥青;利用交联稳定剂可以制备相容性好的聚合物改性道路沥青。路用性能评价采用传统方法和美国战略公路研究计划(SHRP)方法进行。结果表明:塔河沥青具有软化点和针入度指数高的特点;SHRP方法评价表明,尽管塔河沥青老化前后的低温延度低,但是在具有较高的抗高温变形能力前提下,能够保持优良的低温抗裂性。与其他原油制备的改性沥青相比,高沥青质塔河原油制备的苯乙烯-丁二烯-苯乙烯共聚物(SBS)和丁苯橡胶(SBR)改性沥青,具有独特的高、低温性能和更低的感温性。     

SBS改性沥青配合比设计及施工技术的探讨

聚合物改性沥青是一种技术含量和附加值较高的新型优质筑路材料。它通过把聚合物掺入道路沥青中而改善使用性能,能显著延长路面寿命、降低噪声、提高行车舒适性和安全性,SBS沥青作为一种改性沥青胶结料,早在20世纪90年代就已出现,由于SBS是一种热塑性橡胶共聚物,使用量大,费用较高,由于受经济条件限制,所以在国内一直没有大面积推广。     

浅谈改性沥青路面

我国独特的季风性气候和超大超载车辆的激增，使道路早期破坏严重。通过对沥青路面使用性能和普通沥青材料的常用问题进行了分析，得出改性沥青以其良好的高低温性能和弹性恢复性能，必将在等级公路、城市道路、专用道路上得到广泛应用。     

茂名重交通沥青改性研究

结合广州市内环工程项目，立足国产、采用茂名重交通道路沥青进行改性研究，并对改性沥青的微观结构进行了观测，研究表明，采用国产改性沥青修筑高等级沥青路面在技术上和经济上是可行的。     

SBS与沥青、软沥青质的相互作用及其过程

为了研究苯乙烯－丁二烯嵌段共聚物（SBS）与沥青，软沥青质的相互作用及其过程，采用荧光显微照相技术获得聚合物相在沥青中的显微结构，发现SBS在沥青中的溶胀，分散是一个动态平衡的过程，沥青质及聚合物都需要足够的软沥青质来持其在沥青上的稳定，SBS改性沥青具有热溶胀冷析出的特点，SBS相的形态结构受降温速率的影响，改性沥青质在常温存贮过程中会从SBS相中部分出，造成聚合物相的面积百分率减少，软化点下降，存贮稳定性下降。     

改性沥青温度稳定性因素的研究

采用热分析等方法测试了改性沥青在温度改变过程中微观及宏观性能指标,通过对滞物在沥青中的傅和进行研究及对测试结构的分析讨论,发现在用聚合物对沥青进行改笥过程,文中对沥青与聚合物的相互作用机理进行了分析与讨论。     

改性沥青机理及试验

针对改性沥青的力学特性和作用机理,采用试验的方法,对改性纤维混合料进行试验对比研究。聚合物改性沥青是一种物理混溶的过程;聚合物的改性效果,在很大程度上取决于改性剂与沥青之间的相容性;改性剂对沥青的高温性能的改善较为显著,而对沥青低温性能的改善不十分明显;不同种类的改性剂具有不同的功能,实践中应根据当地的气候、交通情况选择。     

布敦岩沥青湿法工艺掺量对 改性沥青混合料性能的影响

为研究采用湿法工艺布敦岩沥青掺量对改性沥青混合料使用性能的影响,采用70号A级道路石油沥青作为基质沥青,制备了最大掺量为基质沥青40%的布敦岩沥青改性沥青.进而采用石灰岩集料,对不同掺量改性沥青进行了AC-20C的沥青混合料马歇尔配合比设计.通过实验室试验,确定了不同掺量布敦岩沥青改性沥青混合料的车辙试验动稳定度、浸水马歇尔试验残留稳定度与冻融劈裂试验残留强度比、弯曲试验破坏应变、渗水系数,还有20℃、15℃抗压回弹模量、15℃劈裂抗拉强度.试验结果与结果分析表明,随着布敦岩沥青掺量的增加,改性沥青混合料的高温稳定性、水稳定性、抗渗性、刚度和强度均不同程度逐渐得到提高.随着布敦岩沥青掺量的增加,改性沥青混合料的低温抗裂性先提高至一峰值,然后略有回落.对于路用沥青混合料,推荐的布敦岩沥青掺量上限为基质沥青的30%.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with